/Engine/Plugins/Runtime/NetworkPrediction/Source/NetworkPrediction/Public/NetworkPredictionProxy.h
Allows ConfigFunc to be invoked to "do a thing" instead of set a new config/id. This is useful because ConfigFunc can make the untemplated caller -> ModelDef jump.
enum EConfigAction { None, EndPlay, UpdateConfigWithDefault, TraceInput, TraceSync, TraceAux, }